How can aliens survive on the energy of a black hole?  science responds

One study reports the use of a giant satellite structure called a Dyson sphere that could be deployed around an inhabited world to redirect the energy generated by black holes.

Mexico City, August 19 (RT). – if any strange civilization Technically developed, it should consume a lot of power. track this hypothesis, More than half a century ago, the Russian astrophysicist Nikolai Kardashov proposed trying to detect great indicators from Earth Energy consumption In the universe and thus the discovery of the existence of a strange civilization. A new study applies this idea to the hypothetical scenario that extraterrestrial intelligence could redirect the energy of a Black hole.

Calculations by an international team of researchers indicate that if aliens reached a certain level of technological sophistication, they would need at least 4 x 10^20 megawatts of power, preferably light. To collect and harness this massive amount of energy, they would have to deploy a gigantic structure called dyson field Scientists believe (named after physicist Freeman Dyson).

The study evaluates which of the available energy sources around black holes could provide more light to feed life and concludes that it would be the accretion disk, among other alternatives such as the cosmic microwave background and Hawking radiation. Of a total of six options, only relativistic jets emerging from a black hole while swallowing other space objects would likely extract more energy, but this would only be possible if the alien Dyson sphere were able to use the spacecraft as well as kinetic energy rather than light. Just.

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The results of the study were collected in the upcoming September issue of the journal Monthly Notices of the Royal Astronomical Society, “It was suggested that for a stellar-mass black hole (…) the accretion disk could provide hundreds of times more luminosity than a main-sequence star.” This equates to 100,000 times the luminosity of the Sun, which is enough to maintain a Type II civilization on the Kardashov scale (human is on the Type I threshold).

The calculations were made for models of black holes accumulating between five and 20 solar masses and also for a giant four million times the mass of the Sun, such as Sagittarius A*, the black hole at the center of our galaxy. Scientists believe a field of satellites can efficiently collect energy in all cases, led by Taiwanese astrophysicist Tiger Yu-Yang Hsiao of National Tsing Hua University.

To collect and harness this massive amount of energy, they would have to spread a giant structure called a Dyson ball around their world. Photo: Sophia Dagnello, NRAO/AUI/NSF

The team also raises the question of whether Dyson balls built around black holes can be detected by terrestrial technology. The authors estimate that: Within our galaxy, multiple propagation of energy-gathering satellites can be detected through “residual” heat at ultraviolet, optical and infrared wavelengths. This discovery can be made by existing telescopes such as the Hubble and Wide Field Infrared Survey Explorer or by ongoing research projects such as the Sloan Digital Sky Survey.

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